Preloader.js is a jQuery plugin to create YouTube like progress bar for your website. It's simple, fast and customizable.
LoadGo is a jQuery plugin that allows you to create a progress bar by using your own images.
ToProgress is a lightweight, no-dependency top progress bar library.
CircularLoader.js is a jQuery plugin made using HTML5 and javascript to create customizable cicular progress bars with or without percentage values. It can be used to create a progress indicator. It is a fully customizable plugin which works with all browsers compatible with HTML5.
A tutorial on how to write a CSS3 progress bar and add some cool animation, along with a jQuery counter.
Fort.js is a modern progress bar for form completion. All you do is add the form and Fort.js algorithm will take care of the rest.
ClassyLoader is a jQuery plugin that lets your add beautiful and animated loaders to your website.
nanobar.js is a super lightweight javascript progress bar plugin.
Progress.js is a JavaScript and CSS3 library which help developers to create and manage progress bar for every objects on the page.
Pace makes a beautiful progress indicator for your page load and ajax navigation.
It will automatically monitor your ajax requests, event loop lag, document ready state, and elements on your page to decide the progress. On ajax navigation it will begin again!